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/*
This file is part of darktable,
copyright (c) 2017 edgardo hoszowski.
darktable is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
darktable is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with darktable. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
kernel void
dwt_add_img_to_layer(global float4 *img, global float4 *layer, int width, int height)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
const int idx = mad24(y, width, x);
layer[idx] += img[idx];
}
kernel void
dwt_subtract_layer(global float4 *bl, global float4 *bh, int width, int height, const float lpass_mult)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
const int idx = mad24(y, width, x);
bh[idx] -= bl[idx];
}
kernel void
dwt_hat_transform_row(global float4 *lpass, global float4 *hpass, int width, int height, const int sc)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(y >= height) return;
const float hat_mult = 2.f;
const int size = width;
if(x < sc)
{
const int h_idx = mad24(y, width, x);
lpass[h_idx] = hat_mult * hpass[mad24(y, width, x)] + hpass[mad24(y, width, (sc - x))]
+ hpass[mad24(y, width, (x + sc))];
}
else if(x + sc < size)
{
const int h_idx = mad24(y, width, x);
lpass[h_idx] = hat_mult * hpass[mad24(y, width, x)] + hpass[mad24(y, width, (x - sc))]
+ hpass[mad24(y, width, (x + sc))];
}
else if(x < size)
{
const int h_idx = mad24(y, width, x);
lpass[h_idx] = hat_mult * hpass[mad24(y, width, x)] + hpass[mad24(y, width, (x - sc))]
+ hpass[mad24(y, width, (2 * size - 2 - (x + sc)))];
}
}
kernel void
dwt_hat_transform_col(global float4 *lpass, int width, int height, const int sc,
global float4 *temp_buffer, const float lpass_mult)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width) return;
const float hat_mult = 2.f;
const int size = height;
if(y < sc)
{
temp_buffer[mad24(y, width, x)] = (hat_mult * lpass[mad24(y, width, x)] + lpass[mad24((sc - y), width, x)]
+ lpass[mad24((y + sc), width, x)])
* lpass_mult;
}
else if(y + sc < size)
{
temp_buffer[mad24(y, width, x)] = (hat_mult * lpass[mad24(y, width, x)] + lpass[mad24((y - sc), width, x)]
+ lpass[mad24((y + sc), width, x)])
* lpass_mult;
}
else if(y < size)
{
temp_buffer[mad24(y, width, x)] = (hat_mult * lpass[mad24(y, width, x)] + lpass[mad24((y - sc), width, x)]
+ lpass[mad24((2 * size - 2 - (y + sc)), width, x)])
* lpass_mult;
}
}
kernel void
dwt_init_buffer(global float4 *buffer, int width, int height)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
const int idx = mad24(y, width, x);
buffer[idx] = 0.f;
}
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